Electric-light vacuum-tube.



No, 672,45l. Patented Apr. 23, ml. D.-McF. MOORE.

ELECTRIC LIGHT VACUUM TUBE.

(Application filed Mar. 26, 1898.)

(No Model.)

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U ITED STATES Aer n.

DANIEL MOFARLAN MOORE, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE MOOREELECTRICAL COMPANY, OF NEW YORK, N. Y.

ELECTRlC-LlGHT VACUUM-TUBE.

SPECIFICATION forming part of Letters Patent No. 672,451, dated April23, 1901.

Application filed March 26, 1898. Serial No. 676,205. (No model.)

To all whom it may concern: The most satisfactory way of adding ter- Beit known that I, DANIEL MOFARLAN minals to the tubes is byelectroplating, and MOORE, a citizen of the United States, and a thebest mode of effecting this is by first roughresident of Newark, in thecounty of Essex ening the parts of the tube where the termi- 5 and Stateof New Jersey, have invented a cernals are to be placed and thenmechanically tain new and useful Electric-Light Vacuumfixing theretosome conducting material, as Tube, of whichthefollowingisaspecification. by dipping the tubes into a bath ofnitrate of 5 This invention relates to the construction silver orlikesubstance, after which they may i of vacuum-tubes or other devices to beused be submitted to the plating-bath. r IO as lamps or sources of lightwhen excited by The places on the tubes for the electrodes 'l electricvibrations, oscillations, or disturbmay be roughened in any suitableway--as ances generated in any desired way-as, for by treating with anacid, such as hydrofluoric fl instance, by interruptions of a circuit ofinacidbut the best results have been produced duction' produced inanydesired manneras, by mechanically roughening the parts to re p,

I 5 for instance, by the means described in my ceive the terminals, asby means of the emo Patent No. 548,127. ery-wheel or sand-blast. Thismode of roughn In the manufacture of vacuum light-tubes ening has theefiect of producing sharp-edged considerable difficulty is experiencedin conpits, grooves, ridges, and projections, which structing andmounting terminals or elecgive the electrodeposited terminal a more in-20 trodes thereon in such a manner as to protimate contact with thesubstance of the tube duce the best luminous effects and to prevent thanhas yet been effected in any other way. a certain crackling, spitting,or hissing noise Vacuum light-tubes provided with electrowhile thecurrent is passing through the tube. deposited terminals will be silent,and aside The object of this invention is the eliminafrom this they haveother advantages over 25 tion of these difficulties; and to that end theterminals consisting of tin -foil or metallic invention consists in theconstruction here paint which have heretofore been used in inafter fullydescribed, and set forth in the that they may be made of greaterthickness, claim. so that they will not be easily scraped off In theaccompanying drawings, which form or torn, and the circuit-conductorsmay be 30 a part of this specification, Figure 1 reprereadily solderedtheretoinstead of having to sents a vacuum light-tube as it comes frombe simply wrapped around them. It is prefthe air-pump. Fig.Zrepresentsitwith rougherable, however, to make these terminals as enedends. Fig. 3 shows the finished tube thin as possible topreventreverberation,and ready for insertion in a circuit; and Fig. 4when too thin for soldering conductors there- 35 represents a tube inthe form of a letter, as to a band of metal may be wrapped about inPatent No. 602,953, granted April 26, 1898. them and the conductorsoldered thereto, as

A represents the vacuum-tube, which may indicated at D, Fig. 3. be madefrom any suitable kind of transpan. The electroplating process isespecially out or translucent material, but preferably adapted to theapplication of terminals to 40 from glass. vacuum-tube letters or othercharacters, be-

B represents the terminals orelectrodes, cause of the more or lessconical or spherical and 0 suitable conductors connected to the shape ofthe projections to which the termio terminals. These conductors may bethe nals must be applied, (see B, Fig. 4.) It is ends of the circuit inwhich the lamp is 10- by these laterally-projecting terminals that 5cated, or they may be short pieces of wire the tubular letters orcharacters are held in soldered or otherwise secured to the termiplace,as well as supplied with current, as nals and by means of which the tubemaybe fully set forth in the latter patent above reconnected into thecircuit. ferred to. I

What I claim as my invention is Signed at New York, in the coiinty offievi As an article of manufacture, a vacuum- York and State of NewYork, this 11th day tube lamp consisting of an exhausted herof March, A.D. 1898.

metically-sealed tube of glass or like mate- DANIEL MOFARLAN MOORE. 5rial devoid of interior electrodes and having Witnesses:

its extremities roughened and electroplated WM. H. OAPEL,

with a conducting material. C. L. BELOHER.

